A first method includes receiving a first reflected radar signal from a target in a first field of view and receiving a second reflected radar signal from a target in a second field of view offset from the first field of view by a predetermined distance; transforming the first and second reflected radar signals to obtain first and second sets of frequency coefficients, from which a frequency-dependent phase difference is obtained; and calculating a time-delay from the slope of the frequency dependence. A second method includes obtaining summed difference values between the first and second radar responses, where each of the summed difference values corresponds to different time shifts between the first and second radar response, and deriving from the summed difference values a time-delay associated with the target's motion from the first field of view to the second field of view. A third method combines the time-delays or associated speeds obtained from independent estimators.

A traffic radar system comprises a first radar transceiver, a second radar transceiver, a speed determining element, and a processing element. The first radar transceiver transmits and receives radar beams and generates a first electronic signal corresponding to the received radar beam. The second radar transceiver transmits and receives radar beams and generates a second electronic signal corresponding to the received radar beam. The speed determining element determines and outputs a speed of the patrol vehicle. The processing element is configured to receive a plurality of digital data samples derived from the first or second electronic signals, receive the speed of the patrol vehicle, process the digital data samples to determine a relative speed of at least one target vehicle in the front zone or the rear zone, and convert the relative speed of the target vehicle to an absolute speed using the speed of the patrol vehicle.

A method, system, and apparatus are provided for a traffic enforcement system. A certification period can be stored and displayed and the device deactivated upon expiration thereof.

A method, system, and apparatus are provided for a traffic enforcement system. A certification period can be stored and displayed and the device deactivated upon expiration thereof.

A method, system, and apparatus are provided for capturing a video image and speed of a target vehicle. A ranging device detects a distance to a target vehicle. The focal distance or zoom of a video camera is set and adjusted based on the distance. The speed of travel of the vehicle is detected, displayed, and/or stored in association with a video image captured of the vehicle by the video camera. A range of distances within which to capture the video image and speed of the vehicle may be set by detecting distances between a pair of landmarks or using GPS and compass heading data. An inclinometer is provided to aid initiation of a power-conservation mode. A target tracking time may be determined and compared to a minimum tracking time period. A device certification period can be stored and displayed and the device deactivated upon expiration thereof.

A method, system, and apparatus are provided for capturing a video image and speed of a target vehicle. A ranging device detects a distance to a target vehicle. The focal distance or zoom of a video camera is set and adjusted based on the distance. The speed of travel of the vehicle is detected, displayed, and/or stored in association with a video image captured of the vehicle by the video camera. A range of distances within which to capture the video image and speed of the vehicle may be set by detecting distances between a pair of landmarks or using GPS and compass heading data. An inclinometer is provided to aid initiation of a power-conservation mode. A target tracking time may be determined and compared to a minimum tracking time period. A device certification period can be stored and displayed and the device deactivated upon expiration thereof.

The invention relates to a method (500) for ascertaining an installation angle (α.sub.Install) between a roadway (170) on which a vehicle (100) travels and a detection direction (122) of a measurement or radar sensor (105). The method (500) has a step (510) of reading a plurality of reflection signals (125), each of which represents a measurement or radar beam (120) which has been emitted by a transmission unit (115) of the measurement or radar sensor (105) and each of which has been reflected on a different reflective section (130) of the vehicle (100). The reflection signals (125) have movement information on a movement direction of the vehicle (100) reflective section (130) on which the measurement or radar beam (120) has been reflected, and/or the reflection signals (125) have position information that represents the position (420) of the vehicle (100) reflective section (130) on which the measurement or radar beam (120) has been reflected. The method (500) additionally has a step (520) of detecting a movement direction component (v.sub.0) of the vehicle (100) reflective section (130) movement directions represented by the movement information from the plurality of reflection signals (125), wherein for said component all of the vehicle (100) reflective sections (130) are carrying out the same movement, and/or detecting a movement direction component (v.sub.0) for which the vehicle (100) reflective section (130) positions (420) represented by the position information are mapped at the same point in time while assuming the movement according to the movement direction component (v.sub.0) and form a shape at said point in time in a two-dimensional display, said shape having the greatest similarity to an L-shape (410). The method (500) lastly has a step (530) of determining the installation angle (α.sub.Install) using the detected movement direction component (v.sub.0).

The invention relates to a method (500) for ascertaining an installation angle (α.sub.Install) between a roadway (170) on which a vehicle (100) travels and a detection direction (122) of a measurement or radar sensor (105). The method (500) has a step (510) of reading a plurality of reflection signals (125), each of which represents a measurement or radar beam (120) which has been emitted by a transmission unit (115) of the measurement or radar sensor (105) and each of which has been reflected on a different reflective section (130) of the vehicle (100). The reflection signals (125) have movement information on a movement direction of the vehicle (100) reflective section (130) on which the measurement or radar beam (120) has been reflected, and/or the reflection signals (125) have position information that represents the position (420) of the vehicle (100) reflective section (130) on which the measurement or radar beam (120) has been reflected. The method (500) additionally has a step (520) of detecting a movement direction component (v.sub.0) of the vehicle (100) reflective section (130) movement directions represented by the movement information from the plurality of reflection signals (125), wherein for said component all of the vehicle (100) reflective sections (130) are carrying out the same movement, and/or detecting a movement direction component (v.sub.0) for which the vehicle (100) reflective section (130) positions (420) represented by the position information are mapped at the same point in time while assuming the movement according to the movement direction component (v.sub.0) and form a shape at said point in time in a two-dimensional display, said shape having the greatest similarity to an L-shape (410). The method (500) lastly has a step (530) of determining the installation angle (α.sub.Install) using the detected movement direction component (v.sub.0).

A system for determining a stationary state of a rail vehicle on a track includes a first radar mounted at an end of the rail vehicle and a second radar mounted at another end of the rail vehicle. A speed sensor is mounted on the rail vehicle. A series of fixed reflective track features are found along the track. A processing unit, communicably connected with the speed sensor, the first radar and the second radar receives data from the first radar and the second radar corresponding to the distance to the fixed reflective track features and determines the stationary state or low-speed condition of the rail vehicle and checks the state or condition by comparing it with an output of the speed sensor.

A data expansion system that provides continuum of discrete wireless small cell coverage areas for mobile terminals includes a set of roadway reflectors configured to provide wireless broadband data services to a mobile terminal. Each reflector includes processing circuitry configured to establish communications between the mobile terminal and a backhaul network. Each reflector includes a wireless transceiver configured to transmit and receive data. Each reflector includes a power source that converts solar energy into electricity. Each reflector includes a housing configured to contain the processing circuitry, the transceiver, and the power source. The housing has a raised reflective surface.